There is now a windows version of g3DGMV. It is at a very early
stage. You're free to download it, although it is not fully functional.
The g3DGMV program was designed as a free viewer for Digital Elevation Model (DEM ) and Digital Line Graphs (DLG ) maps. Both of these formats are available from various locations on the web. These maps can be manipulated by the user and view from different angles.